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The Berlin X2 is the latest evolution of the popular Berlin range of skimmers, used by thousands of satisfied aquarists around the world since 1993. The X2 offers a 50% increase in skimming performance over the old model, while preserving its predecessor's small footprint and compact dimensions. Red Sea's patented Triple-Pass maximizes the water-air contact time inside the skimmer's reaction chamber, stripping the aquarium water of even the smallest traces of organic pollutants, while minimizing the external dimensions and footprint of the skimmer. By forcing the water-air mixture along a circuitous route, the Berlin X2 achieves a total surface area equal to that of much larger conventional skimmers. The X2 skimmer includes the new FoamView collection cup. It features a patented window built into the side of the collection cup, allowing for accurate, real-time evaluation of foam production. Designed for both in-sump and hang-on use, all Berlin X2 models also include a hang-on kit, enabling the in-sump configuration to be converted quickly and easily for hang-on aquarium setups.

I do not like this skimmer at all. Its just too touchy o keep running correctly. My take a few days to get it adjusted correctly, then if you shut it off and turn back on again, you have to re adjust it all over again. But you can find a great deal on them if you don’t mind the constant adjustments.